Weighing-scale.



M. SCHWARTZ. WEIGHING SCALE.

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M. SCHWARTZ.

WBIGHIN G SCALE.

- AiPLIoATIoN FILED JUNE 8,'1908. 918,777. Patented Apr. 2o, 1909.

M. SCHWARTZ. WBIGHING SCALE.

, APPLIUATION FILED JAUNE 8, 1906. 91 8,777. ,Patented Apr. 2o, 1909.

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MORRIS SCHWARTZ, OF CHICAGO, ILLINOIS, ASSIGNOR 'IO AMERICAN CUILERYCOMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

WEIGHING-SCALE.

To all whom it may concern:

Be it known that I, MoRRrs SCHWARTZ, a citizen of the United States,residing at Chicago, in the county of Cook and State of Illinois, haveinvented a new and useful Improvement in TWeighing-Scales, of which thefollowing is a specification.

My invention relates, more particularly, to the variety of scales forweighing comparatively light articles, and comprising, in general, anupright standard carrying the article-support, a dial on the front ofthe scalecasing, a pointer for the dial carrying a pinion, and meansoperated by the article-support for actuating the pinion.

IIeretofore, so far as I am aware, the construction of scales of thistype has been such as to render impossible, under all conditions, theaccurate weighing of articles placed on the scale, especially should thearticle be placed on the article-support in such a position as to causethe latter to tilt, this result being caused by the transmission oflost-motion in the lever-bearings to the rack engaging with thepointer-pinion. Another obj ectionable feature of scales, as hithertoprovided, is that the rack engaging with the pointer-pinion is soconstructed and connected with the operating mechanism of the scale thatit is caused to be moved in an arcshaped path, and thus in moving shiftssidewise on the pinion instead of operating throughout its movementagainst the pinion at a given point intermediate the ends of the pinion,thereby producing such a degree of friction as prevents accurateweighing.

My primary object is to overcome these objections, and to provide aconstruction by which shifting of the rack endwise of the pointer-pinionis avoided, and accurate weighing of articles may be effected,regardless of the position in which the article is placed on theweighing platform.

Referring to the accompanying drawings- Figure I represents by a view infront elevation a scale of the slanting-dial type constructed inaccordance with my invention. Fig. 2 is a view in longitudinal sectionalelevation of the scale illustrated in Fig. l. Fig. 3 is a perspectiveview of the rack-bar einployed. Fig. 4 is a brolren view in frontelevation of the scale with the dial and pointer removed; and Fig. 5 isa section taken at the Specification of Letters Patent.

Application led .Tune 8, 1908.

Patented April 20, 1909.

Serial No. 437,269.

line 5 on Fig. 2, and viewed in the direction of the arrow.

The casing of the scale which is represented at 6, affords a removablerear side 7, a base 8 and a slanting dial-supporting member 9 whichlatter, as illustrated, contains a vertically elongated slot IO whichextends to within a short distance of the top and bottom of the member9.

The platform 1 I is carried on the upper end of a verticallyreciprocable standard l2 which extends through an opening 13 in the topof the casing 6 and is of yoke-shape at its lower end-portion, affordingarms la which converge downwardly as represented. Secured in the casing,near its rear end, is an upright inverted U-shaped frame l5, in theupper end-portion of which is journaled a rod 16 to which a slightlyupwardly-inclined, forwardly extending frame 17 of yoke-shape affordingspaced arms 18 is fhxed at lugs 19 thereon, the forward ends of the armsI8 embracing between them the yoke-frame lll at which ioints the arms ISand frame I4 are pivote together, as represented at 20.

The lower ends of the frame l5 support a rigid cross-bar 2l affordingtwo spaced depending lugs 22 intermediate its ends, between which lugsand a rod 23 secured therein the rear headed end 24 of aforwardlyextending leverarm 25 approximately paralleling the frame 17,is journaled. The lower ends of the frame-arms I4 are rigidly fastenedto an arm 26 on opposite sides of its horizontal portion 27 between theends of the latter, the forward downwardly inclined end 28 of the arm 26being bifurcated to present depending arms 29, which embrace andpivotally connect with the leverarm 25 near its forward end, asrepresented at 30. The rear end of the arm 27 is connected at an opening3l therein with the lower end of a vertically disposed coiled spring 32,which is connected near its upper end, in any suitable manner, to thelower end of a threaded rod 33, which extends upward through an opening34 in the top of the casing 6 and carries beyond this casing anadjusting screw 35 seating in a depression 36 in the casing top.

The dial-supporting member 9 has secured to it to extend longitudinallythrough the slot l() a pair of parallel spaced gui e-rods 37 upon whichis slidably confined to be reciprocable up and down, a cross-head 38 ofangular shape in cross-section affording a depending lip 39 and arearwardly extending flange 40 through openings 41 in which the rodsextend. The front face of the lip 39 has a plate 42 rigidly secured toit at one end as by the rivet 43, the outerfree end of this plate beingflanged as represented'at 44, between which flange and the lip 39 arackbar 45 is pivoted at a lug 46 thereon, as indi cated at 47 near oneend of an upper corner thereof, to lie flatwise against a guide-plate 48depending from the cross-head 38 and in the rear of the bar 45, andhaving a rearwardly extending flange 49 at its lower end through whichthe adjacent one of the rods 37 passes for supplementing the guidingaction on the cross-head 38 at its flange 40. The bar 45 has rack-teeth50 on one of its lateral edges and carries near its upper end on itsopposed lateral edge an extension 51 which serves as a weight tending toswing the bar 45 upon its pivot 47 in a direction to the left in Fig. 4.

The member 9 is provided centrally with a rib 52 which spans the slot 10intermediate its ends, and ournaled in this rib is a pinion 53 whichextends at a stub-shaft 54 thereon through the central opening 55 in thedialplate 56, of usual construction, and carries a pointer 57.

The pinion 53 is caused to be engaged by the teeth 50 on the rack-bar 45by pivoting the latter and weig iting it as described, so that it willtend to swing toward the pinion, it being designed that these parts beso constructed as to cause the teeth on the bar 45 to bear against theteeth on the pinion 53 with as slight pressure as is consistent withpositive engagement of the rack with the pinion.

The flange 40 of the cross-head 38 has two rearwardlyT extending lugs 58between which is ivoted, as represented at 59, the upper enc of the link60, the lower end of this link being pivotally connected with theextreme bifurcated forward end of the lever-arm 25, as represented at61.

rlhe o eration of the scale is as follows: An artic e to be weighedplaced on the platform causes the standard 12 to be depressed againstthe resistance of the spring 32, the frame 17 and lever-arm 25 rockingat their pivotal connections with the arms 14 and 29 respectively andwith the frame 15. The arm 25 is thus caused to be depressed at itsforward end with the result of drawing down the cross-head 38 upon theguide-rods 37, and with this head the rack-bar 45 which latter, inengaging with the pinion 53 as before described, 'causes the latter toturn, thereby moving the pointer.

It will be understood that the spring 32 is so adjusted by manipulatingthe screw 35 that the pointer will be operated, .when an article isplaced on the platform 11, to indicate on the dial the exact weight ofthe article.

lt will be noted that the rack-bar in moving in engagement with thepinion presents its teeth at right-angles to the teeth on the latter,and that the rack-bar does not shift lengthwise on the pinion, but ismaintained at all times in engagement with it at a given pointintermediate the ends of the pinion, and thus the operation of theseparts is performed with minimum resistance as compared with theoperation of corresponding parts in constructions in which the rack-baris caused to travel in a curved path, Furthermore, any lost-motionexisting in the pivotal connections of the lever-mechanism intermediatethe platform standard and cross head carrying the pinion engaging rack,is not communicated to the rack-bar, as the latter is positively guidedand maintained in true alinement by engagement with the rods 37, andthus any tipping of the scale-platform, which, if the connections of theintermediate lever-mechanism were loose for any cause, would not affectthe operation of the pointer, and the scale therefore accuratelyindicates the weight of the article being weighed.

The platform 11 may be secured to the standard 12 in any suitablemanner, but as it is desired that the connection be such that the edgesof the platform, which is usually square, be maintained in fixedposition at all times, l form a square head 62 on the upper end of thestandard 12 and provide on the under side of the platform dependingflanges G3 forming a rectangular socket for receiving the square-head 62on the standard, the )erts being united together in the usual way xy ascrew 64.

The expression spring-supported means occurring in certain of the claimsrefers to that part of the-scale which is composed of the standard 12,the levers directly fuicrumed thereto, and the spring 32, though l. donot wish to be understood by the use of the said term as limiting myinvention tc its embodiment in a scale in which the lever mechanismlast-above referred to, or similar thereto, is employed, as any othersuitable spring-supported means for affording to the standard the roperguidance in its movement may be emp eyed and still be within the spiritof my invention as claimed.

llt/That l claim as new, and desire to secure by Letters Patent, is-

1. ln a slanting-dial weighing-scale, the combination with a casingcarrying a slanting dial, spring-supported means for receiving thearticles to be weighed, a pointer for indicating the weight on saiddial, and a pinion connected with said pointer, of a rack engaging withsaid pinion, a guide for the rack in its movements constructed andarranged to cause the latter' to travel in a straight path whenoperated, and a flexible connection between said support and rack, forthe purpose set forth.

2. 1n a slanting-dial weighing-scale, the conibinationwith a casingcarrying a slanting dial, spring-supported nieans for receiving thearticles to be weighed, a pointer for indieating the weight on saiddial, and a pinion connected with said pointer, of a guide, a rackslidable on said guide and engaging at its teeth with said pinion, and alinh carried by said support and iaving iiexible operative connectionwith said rack for operating it, for the purpose set forth.

3. 1n a slanting-dial weighing-scale, the combination with a casingcarrying a slanting dial, spring-supported ineans for receiving thearticles to be weighed, a pointer for indicating the weight on saiddial, and a pinion connected with said pointer, of a guiderod, a rackslidable on said rod and engaging at its teeth with said pinion, and alink carried by said support and having flexible operative connectionwith said rack for operating the latter, for the purpose set forth.

4. 1n a Weigl'iing-scale, the combination with the support for thearticles to be .veighed, a pointer for indicating the Weight, and apinion connected with the pointer, of a guide, a head slidable on saidguide and carrying a guide-plate, a rack-bar pivoted on said headbearing at its teeth against the pinion and bearing at a face thereofagainst said plate, and ineans constructed and arranged to be operatedby the inoveinent of said support for operating said head, for thepurpose set forth.

5. ln a weighing-scale, the combination with the support for thearticles to be weighed, a pointer for indicating the weight, and apinion connected with the pointer, of a guide, a head slidable on saidguide, a rachbar pivoted near its upper end on said head and providedwith an extension at a point causing the bar to be swung toward thepinion and' be held in engagement therewith and ine-ans constructed andarranged to be operated by the inovenient of said support for operatingsaid head, for the purpose set forth.

6. ln a weighing-scale, the combination with the support for thearticles to be weighed, a pointer for indicating the weight, and apinion connectedwith the pointer, of a guide fornied of parallel bars, ahead slidably connected with said bars near its upper end and. having adepending guide-plate slidably engaging one of said bars,a rack-barpivoted to said head bearing fiatwise against the guide-plate andengaging at its teeth with the teeth on the pinion, and ineensconstructed and arranged to be operated by the inoveinent of saidsupport for operating said headforgthe purposelse y 7. 1n aweighing-scale, the combination with the support for the articles to beweighed, a pointer for indicating the weight, and a pinion connectedwith the pointer, of a guide, a rack slidable on said guide and engagingat its teeth with said pinion, pivotally supported lover-mechanism withwhich said support is connected, a spring for yieldingly holding saidsupport in raised position, and a linl; connected with saidlever-mechanisin and said racli, for the purpose set forth.

S. 1n a weighing-scale, the combination with the support for thearticles to be weighed, a pointer for indicating the weight, and apinion connected with the pointer, of a racl; slidable on said guide andengaging at its teeth with the pinion, a pair of substantially parallelhoriaontal lever franies pivoted to the casing, a standard carrying saidsupport and pivoted to said franies, a spring tending to hold saidfranies and standard in raised position, and a link pivotally connectedwith one of said fraines and with the raclt for the purpose set forth.

9. ln a weighing-scale, the combination with the support for theait-icles to be wei-hed, a pointer for indicating the weight, and apinion connected with the pointer, of aguide, a rack slidable on saidguide and engaging at its teeth with said pinion, a series ofroch-levers to which said support is connected, a spring for yicldinglyholding said support in raised position, and a link connected with saidrock-lever niechanisni and pivoted to said rack, for the purpose setforth.

10. 1n a slanting-dial weighing-scalo, the combination with a casingcarrying a slanting dial, a support for articles to be weighed, apointer for indicating the weight on said dial, and a pinion connectedwith said pointer, of a guide, a head slidably supported on said guidein a inanner to cause said head to travel in a straight path whenoperated, a rack carried by said head and engaging at its teeth withsaid pinion, and a link carried by said support and having flexibleoperative connection with said rack for operating the latter, for thepurpose set forth.

11. in a weighing-scale, the combination with a standard for receivingthe articles to be weighed, a pointer for indicating the weight, and apinion connected with the pointer, of a guide-rod, a rack slidable on.

said rod and engaging at its teeth with saidf"l pinion, pivotallysupported lever niechanisin with which said standard is connected,ineans for yieldingly holding said standard in raised position., and alinh connected with said lever inechanisni and serving to operate saidrack, for the purpose set forth. l2. ln a weighing-scale, thecombination with the support for the articles 'p to be weighed, apointer for indicating the weight, and a pinion connected with thepointer, of

e guide-rod, e member slideble on seid guideiod zuid positively guidedthereby, e mol; carried by said member mid engaging with said pinion,pivotelly supported level1 mech- 5 mism with which said support isconnected, men-ns 'for yieldingly holding said support in raisedposition, :mda link flexibly connectedv With said member and with saidle- Vei' mechanism, for the purpose Set forth. MORRIS SCHVARTZ.

Inpresenoe Of W. B. DAVIES, R. A. SCHAEFER.

